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Development of the graphite-moderated neutron calibration fields using $$^{241}$$Am-Be sources in JAEA-FRS

Nishino, Sho   ; Tanimura, Yoshihiko   ; Ebata, Yoshiaki*; Yoshizawa, Michio  

We developed the graphite-moderated neutron calibration fields using $$^{241}$$Am-Be sources at the Facility of Radiation Standard in the Japan Atomic Energy Agency. The neutron spectra of the fields were evaluated by Monte-Carlo calculation and measurements using the Bonner Multi-sphere Spectrometer. Reference values of fluence rates and dose equivalent rates of H$$^{*}$$(10) and H$$_{rm p}$$(10) were determined from neutron spectra by measurements. Currently, our fields are available for calibration or performance test of neutron measuring instruments.

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